From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0EE1C32BF51 for ; Fri, 16 Jan 2026 14:20:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768573223; cv=none; b=WiKNTSdIvrRtPGF12adJC6fMORQG0VTfQU1JXUusdmlTAYpKNTxV/fc4XKQ8274lq/K1s3j4qR20bnL9gYtlmqstQCul1g54Z+DfvKFw32n16q+X0T9pa+32PCmK4+yqCbHgz4VswATMYCqH3rBe9FHO9/Xwnz36W5+LAhwFMS8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768573223; c=relaxed/simple; bh=L92/ImjpXwMrsYJfdKzLJqeujYX+xnx3PspaP4kW7us=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=N7yq6+Bpwh/eGNnAfQiAtL4oMzifIqguqAu7sAR8soMEGDkZVmnwKZGz0qVyOwhuRkxmMzGaU1X1yobjJGVkJl/AORWqz8madU2D+LddiqsroGwVJ65N5kkRspihNavVWa3X6ncDlckNhDy5yTaueVbxi5CtbRDsoc/AWmmoCHs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=EiWxvmOv; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="EiWxvmOv" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1768573217; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zQB5W5FH3pR6W1G8zoMgE7xGbu8+zvpljpRTILIGylo=; b=EiWxvmOvAY4ye9gdy/+6MCrQsbpDBT7cR7FToE9ZmZFF4D50lCRAMv4xbXr8TqPEx/I7jv MBWHbebG7Rt9IUUhU8Qry4vuzGjTVLUB2L5A0Sz99y4TlG894ZtYh6mtXeoPdmA1sQmCxx WamqjjyHQ/Aasz7ZnUJs8yt/p8KtQhQ= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-564-hzKsOZ-HN36bRAWI8jHnyQ-1; Fri, 16 Jan 2026 09:20:13 -0500 X-MC-Unique: hzKsOZ-HN36bRAWI8jHnyQ-1 X-Mimecast-MFC-AGG-ID: hzKsOZ-HN36bRAWI8jHnyQ_1768573212 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E80551956050; Fri, 16 Jan 2026 14:20:11 +0000 (UTC) Received: from localhost (unknown [10.72.116.198]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D5CE21955F22; Fri, 16 Jan 2026 14:20:10 +0000 (UTC) From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org Cc: Caleb Sander Mateos , Uday Shankar , Ming Lei Subject: [PATCH V6 13/24] ublk: implement batch request completion via blk_mq_end_request_batch() Date: Fri, 16 Jan 2026 22:18:46 +0800 Message-ID: <20260116141859.719929-14-ming.lei@redhat.com> In-Reply-To: <20260116141859.719929-1-ming.lei@redhat.com> References: <20260116141859.719929-1-ming.lei@redhat.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Reduce overhead when completing multiple requests in batch I/O mode by accumulating them in an io_comp_batch structure and completing them together via blk_mq_end_request_batch(). This minimizes per-request completion overhead and improves performance for high IOPS workloads. The implementation adds an io_comp_batch pointer to struct ublk_io and initializes it in __ublk_fetch(). For batch I/O, the pointer is set to the batch structure in ublk_batch_commit_io(). The __ublk_complete_rq() function uses io->iob to call blk_mq_add_to_batch() for batch mode. After processing all batch I/Os, the completion callback is invoked in ublk_handle_batch_commit_cmd() to complete all accumulated requests efficiently. So far just covers direct completion. For deferred completion(zero copy, auto buffer reg), ublk_io_release() is often delayed in freeing buffer consumer io_uring request's code path, so this patch often doesn't work, also it is hard to pass the per-task 'struct io_comp_batch' for deferred completion. Reviewed-by: Caleb Sander Mateos Signed-off-by: Ming Lei --- drivers/block/ublk_drv.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 2783af67ed10..e6e746cd369e 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -136,6 +136,7 @@ struct ublk_batch_io_data { struct io_uring_cmd *cmd; struct ublk_batch_io header; unsigned int issue_flags; + struct io_comp_batch *iob; }; /* @@ -691,7 +692,7 @@ static blk_status_t ublk_setup_iod_zoned(struct ublk_queue *ubq, #endif static inline void __ublk_complete_rq(struct request *req, struct ublk_io *io, - bool need_map); + bool need_map, struct io_comp_batch *iob); static dev_t ublk_chr_devt; static const struct class ublk_chr_class = { @@ -1001,7 +1002,7 @@ static inline void ublk_put_req_ref(struct ublk_io *io, struct request *req) return; /* ublk_need_map_io() and ublk_need_req_ref() are mutually exclusive */ - __ublk_complete_rq(req, io, false); + __ublk_complete_rq(req, io, false, NULL); } static inline bool ublk_sub_req_ref(struct ublk_io *io) @@ -1388,7 +1389,7 @@ static void ublk_end_request(struct request *req, blk_status_t error) /* todo: handle partial completion */ static inline void __ublk_complete_rq(struct request *req, struct ublk_io *io, - bool need_map) + bool need_map, struct io_comp_batch *iob) { unsigned int unmapped_bytes; blk_status_t res = BLK_STS_OK; @@ -1442,8 +1443,11 @@ static inline void __ublk_complete_rq(struct request *req, struct ublk_io *io, local_bh_enable(); if (requeue) blk_mq_requeue_request(req, true); - else if (likely(!blk_should_fake_timeout(req->q))) + else if (likely(!blk_should_fake_timeout(req->q))) { + if (blk_mq_add_to_batch(req, iob, false, blk_mq_end_request_batch)) + return; __blk_mq_end_request(req, BLK_STS_OK); + } return; exit: @@ -2478,7 +2482,7 @@ static void __ublk_fail_req(struct ublk_device *ub, struct ublk_io *io, blk_mq_requeue_request(req, false); else { io->res = -EIO; - __ublk_complete_rq(req, io, ublk_dev_need_map_io(ub)); + __ublk_complete_rq(req, io, ublk_dev_need_map_io(ub), NULL); } } @@ -3214,7 +3218,7 @@ static int ublk_ch_uring_cmd_local(struct io_uring_cmd *cmd, if (req_op(req) == REQ_OP_ZONE_APPEND) req->__sector = addr; if (compl) - __ublk_complete_rq(req, io, ublk_dev_need_map_io(ub)); + __ublk_complete_rq(req, io, ublk_dev_need_map_io(ub), NULL); if (ret) goto out; @@ -3533,11 +3537,11 @@ static int ublk_batch_commit_io(struct ublk_queue *ubq, if (req_op(req) == REQ_OP_ZONE_APPEND) req->__sector = ublk_batch_zone_lba(uc, elem); if (compl) - __ublk_complete_rq(req, io, ublk_dev_need_map_io(data->ub)); + __ublk_complete_rq(req, io, ublk_dev_need_map_io(data->ub), data->iob); return 0; } -static int ublk_handle_batch_commit_cmd(const struct ublk_batch_io_data *data) +static int ublk_handle_batch_commit_cmd(struct ublk_batch_io_data *data) { const struct ublk_batch_io *uc = &data->header; struct io_uring_cmd *cmd = data->cmd; @@ -3546,10 +3550,15 @@ static int ublk_handle_batch_commit_cmd(const struct ublk_batch_io_data *data) .total = uc->nr_elem * uc->elem_bytes, .elem_bytes = uc->elem_bytes, }; + DEFINE_IO_COMP_BATCH(iob); int ret; + data->iob = &iob; ret = ublk_walk_cmd_buf(&iter, data, ublk_batch_commit_io); + if (iob.complete) + iob.complete(&iob); + return iter.done == 0 ? ret : iter.done; } -- 2.47.0